Ringing-generator.



ANo. 720,595. PATENTED FEB. 1'7, 1903.

l J. G. P. MALTHANER.

RINGING GENERATOR.

APPLICATION FILED SEPT. 1s, 1902.

No MODEL.

All: A i g; 'l *Q u" Mil-763223 ki LL a m l L--- St' a* UNITED STATES v PATENT OFFICE.

JOHN C. F. MALTHANER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE- I-IALF TO O. THERIEN, OF MINNEAPOLIS, MINNESOTA.

RlNGlNG-GENERATOR.

SPECIFICATION forming part of Letters* Patent No. 720,595, dated February 17, 1903. Application filed September 18, 1902. Serial No. 123,267. (No model.)

To all whom, 722 may concern: Figs. l and 3,) the springs 17 and 23 being 5o Be it known that I, JOHN O. F. MALTHA- connected to source of current of one polarity NER, of Minneapolis, Hennepin county, Minor to one pole of battery 25, and the springs nesota, have invented certain Improvements 21 and 19 being connected to source of curin Ringing-Generators,'of which the followrent of opposite polarity or to other pole of ing is a specification. battery 25. The secondary Winding 9 upon 55 This invention relates to improvements in the bobbin in which the secondary circuit is magneto-electric generators, designed espesecured is connected to the binding-posts 27 cially for use in connection with telephone and 29. Io systems for ringing the call-bells employed 31 represents an ordinary alternating-curtherein; and the invention consists generally rent bell located at any convenient point and 6o in an oscillating core having two windings connected to the binding-posts 27 and 29 by thereon, one for the primary circuit and the a suitable conductor 32. The bell is thus loother for the secondary circuit, and means for cated in the secondary circuit. A suitable reversing the polarity of the core, whereby condenser 35 may be bridged across the priwith a primary circuit of low voltage I am mary winding to lessen the sparking at the enabled to secure, by means of the oscillating contact-points. core, asecondary alternating current of high Operation: The current from the battery potential. .25 passing through the springs 19 and 23 zo The invention consists, further, in the con-V and around the softiron core through the structions and combinations hereinafter deprimary winding 7 changes the polarity of 7o scribed, and particularly pointed out in the the core 3, which is then drawn to the oppoclaims. site side of the permanent magnet 2. This In the accompanying drawings, forming breaks the circuit through the springs 19 and :5 part of this specification, Figure 1 is a plan 23 and closes it through the springs 17 and view of a ringing-generator embodying my 21. This reverses the primary current and invention. Fig. 2 is a vertical section of the again changes the polarity of the core, which same. Fig. 3 is an end elevation. is drawn to the other side, breaking the cir# In the drawings, 2 representsapermanent cuit through springs 17 and 21 and again 3o magnet secured in a fixed position upon a closing it through springs 19 and 23. A

suitable base et by any suitable means. rapid oscillation of the bobbin is thereby se- 8o 3 represents a soft-iron .core mounted at cured and simultaneous reversals of the curone end upon pivot-screws 5 and capable of rent through the primary winding of the boboscillating in the plane of the magnet 2. bin. This generates an alternating current 35 Upon the soft-iron core 3 are two windings in the secondary Winding. By this means of insulated wire 7 and 9, the inner windwith a primary current of low voltage a sec- 85 ing constituting the primary circuit and the ondary current of high'potential is secured. other winding the secondary circuit. The Two cells of battery are allthat need be used bobbin heads or ends 11 are arranged upon for the primary circuit. By this means I 4o the core'3 and serve to retain the windings 7 am enabled to secure in a single coil the step and 9 in position. The core 3 and the ends up from the low voltage of the primary cir- 9o 11 constitute a bobbin for holding the Wires cuit to the high potential required in the secof the primary and secondary circuits. Seondary circuit. I do not limit myself to cured upon the bobbin are the contact-springs any particular ratio between the primary and 45 13 and 15, and to these springs the ends of secondary windings, as the same may be the Wires constituting the primary winding varied as may be necessary to secure the volof the bobbin are connected. (See Fig. 1.) tage desired in the secondary circuit.

Secured upon the base 4 of the device are I claim as my invention the contact-springs 17, 19, 21, and 23, (s ee 1. The combination, in a generator of the class described, with the contactesprings and the source of electric current, of the oscillating bobbin provided with the primary and secondary windings, substantially as described.

2. The combination, in a generator of the class described, with the pivoted core provided with the primary and secondary Windings, of the contact-springs and a source of electric current/.connected to said contactsprings,lsubstantia1ly as described.

3. The lcombination, in a generator of the class described, with the permanent magnet, of the pivoted core provided with the primary and secondary windings, the contactsprings and a source of electric current con- 

